Dear Customer, There have been some changes in our product. Therefore, please click on the corresponding tab above to look up the information for your individual product. For products with the serial number 8860119052 and higher (purchased from January 2023 onwards), please click on the tab named "Art. No. 12784". For products with the serial number 8860119051 and lower, please click on the tab named "Art. No. 11414". You'll find the serial number at the label in front of your product's valve block (below the electronic control).